Showing papers by "Periklis Petropoulos published in 2023"
TL;DR: In this paper , a quantitative study of the effects of birefringence in orthogonal-pump four-wave mixing systems, and identify different regions of operation of the optical fiber, mainly determined by the relative magnitude between the physical length L and beat length Lb.
Abstract: Optical fibers have unwanted residual birefringence due to imperfections in fabrication processes and environmental conditions. This birefringence will randomize the state of polarization of propagating signals and may harm the performance of four-wave mixing based processing devices. Here, we present a quantitative study of the effects of birefringence in orthogonal-pump four-wave mixing systems, and identify different regions of operation of the optical fiber, mainly determined by the relative magnitude between the physical length L and beat length Lb. This finding clarifies the characteristics of the complex interplay between birefringence and four-wave mixing and advises appropriate fiber length selection for minimized polarization dependent gain.
TL;DR: In this article , the authors propose a technique for modeling erbium-doped fiber amplifiers (EDFAs) in optical fiber networks, where the amplifier unit is located at a distant node outside the laboratory.
Abstract: We propose a technique for modeling erbium-doped fiber amplifiers (EDFAs) in optical fiber networks, where the amplifier unit is located at a distant node outside the laboratory. We collect data on an optical point-to-point link with the amplifier as the only amplification stage. Different amplifier operating points are modeled using probe signals and by adjusting the settings of the amplifier through a control network. The data are used to train a machine learning algorithm integrated within a physical EDFA model. The obtained mathematical model for the amplifier is used to model all amplifiers of a network and links with multiple amplification stages. To confirm the modeling accuracy, we thereafter predict and optimize launch power profiles of two selected links in the network of 439.4 km and 592.4 km lengths. Maximum/average channel optical signal-to-noise ratio prediction errors of 1.41/0.68 dB and 1.62/0.83 dB are achieved for the two multi-span systems, respectively, using the EDFA model trained on the single span system with margin-optimized launch power profiles. Up to 2.2 dB of margin improvements are obtained with respect to unoptimized transmission.
TL;DR: In this paper , the authors demonstrate U-band Raman amplification in non-zero dispersion shifted fiber, exploiting the amplified spontaneous emission of an erbium-doped fiber amplifier as a broad-bandwidth, incoherent pump for low-noise amplification.
Abstract: We demonstrate U-band Raman amplification in non-zero dispersion shifted fibre, exploiting the amplified spontaneous emission of an erbium-doped fibre amplifier as a broad-bandwidth, incoherent pump for low-noise amplification. By doing so, we achieve a high overall gain of ∼22 dB over a 3-dB bandwidth of ∼2.6 THz and obtain noise figures better than 4.3 dB and 5 dB in a 40 km-long, discrete amplifier configuration, in forward pumped and backward pumped scenarios, respectively. The performance of the U-band Raman amplification is also studied through transmission of a coherent signal over a 285-km point-to-point link. This work represents, at the time of writing, the longest-reach single-span U-band transmission demonstrated.
TL;DR: In this paper , a bismuth-doped fiber amplifier (BDFA) based optical recirculating loop was implemented to investigate the performance of amplified O-band transmission over appreciable distances.
Abstract: We implemented a bismuth-doped fiber amplifier (BDFA) based optical recirculating loop to investigate the performance of amplified O-band transmission over appreciable distances. Both single-wavelength and wavelength-division multiplexed (WDM) transmission were studied, with a variety of direct-detection modulation formats. We report on (a) transmission over lengths of up to 550 km in a single-channel 50-Gb/s system operating at wavelengths ranging from 1325 nm to 1350 nm, and (b) rate-reach products up to 57.6 Tb/s-km (after accounting for the forward error correction redundancy) in a 3-channel system.
01 Mar 2023
TL;DR: In this article , mid-span pump-phase shift was applied to the wavelength conversion of a 9 channel WDM band in order to suppress inter-channel nonlinear crosstalk.
Abstract: We apply mid-span pump-phase shifting to the wavelength conversion of a 9 channel WDM band in order to suppress inter-channel nonlinear crosstalk. SNR improvements between 3-6dB are observed through the use of the technique
01 Mar 2023
TL;DR: In this article , the first WDM O-band coherent transmission experiment in a BDFA-amplified link was reported, where four 25 GBd DP-16QAM channels (4×200 Gb/s) were transmitted over 50 km of fiber, occupying a bandwidth of 4.7 THz.
Abstract: The first WDM O-band coherent transmission experiment in a BDFA-amplified link is reported. Four 25 GBd DP‑16QAM channels (4×200 Gb/s) are transmitted over 50 km of fiber, occupying a bandwidth of 4.7 THz. © 2023 The Author(s)